(The HPMOR discussion thread after this one is here.)
The previous thread is over the 500-comment threshold, so let's start a new Harry Potter and the Methods of Rationality discussion thread. This is the place to discuss Eliezer Yudkowsky's Harry Potter fanfic and anything related to it. The latest chapter as of 09/09/2011 is Ch. 77.
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven, eight. The fanfiction.net author page is the central location for information about updates and links to HPMOR-related goodies, and AdeleneDawner has kept an archive of Author's Notes.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it's fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that "Eliezer said X is true" unless you use rot13.
I find myself wondering about the supposed safety of Hogwarts. The wards are given as an explanation for this but if students are able to constantly hex each other in the halls, Quirrel is able to cast extremely powerful spells, and an unnamed 6th year replicated the Sectumsempra incident from cannon without any apparent interference from the wards I cant imagine what it is exactly that the wards are supposed to do to insure the safety of the students.
Consider that the school is full of 11-18 year olds with access to weapons of mass destruction and it seems to me that the apparent safety of the place for the past 50 years is due to luck rather then anything inherent in system.
From Ch. 36:
Now the "all spells are stunners" isn't always true, but for the most part (at least in canon) the hexes they use aren't really powerful. But I think that most of the safety record is due to the latter two factors. How many times in canon have characters had injuries that would have required many months of physical therapy in the real world, and been fine a week later?